The earth's precious energyextremely slowly during thhistory. We must use these precioupossible. Operating at more than 48Toshiba's combined cycle pheat-recovery/power- gener

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Like ocean snow flakes floating slowly to the seafloor for countless millennia, our precious energy resources have accumulated as a result of enormous geological pressures over eons.

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s resources as efficiently as

% thermal efficiency, ower plants offer the best ation systems available.

The energy is released for the benefit of humanity...

Combined-cycle power plantA "combined-cycle power plant" recov-ers heat from the gas turbine's exhaust,uses the heat to generate steam in aheat-recovery steam generator, then thesteam is used to generate electricity.This is one of several methods used byToshiba to help its customers use exist-ing energy resources more efficiently.

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Higher efficiency and better operability Heat Recovery Combined Cycle If a power plant's output was our only consideration, our task as a manufacturer would be far simpler. However, because increased output, reduced fuel consumption, and environmentalconsiderations are equally as important, we've developed our combined-cycle power planttechnologies to meet these needs. The combined-cycle process operates at 48% thermalefficiency, generates larger output capacities, and consumes less fuel. Additional combined-cycle advantages are reduced NOx missions and improved unit operability.

■■■■Heat Recovery Combined Cycle

Toshiba's highly efficient 1300°C class gasturbine, large-scale heat recovery steamgenerator, and specifically designed steamturbine enable thermal efficiency of more than48%, exceeding conventional large-scalethermal power plants. Recovering heat from thegas turbine's exhaust results in a 40% reductionof cooling water required, compared toconventional power plants.

Type 109FA 107FAType MS9001FA MS7001FAUnit 1 Output (MW) 219 153 Speed (rpm) 300 3600

Gas turbine

Inlet Temp. (°C) 1300 Press Stages 3 Pressure Stages Heat Recovery Steam

Generator Unit 1 Unit 1 Steam Turbine Output (MW) 123 85 Thermal efficiency (%) 48 48 Plant Output (MW) 342 238

*At ISO condition, on HHV base; at generator output terminals.

■■■■Standard Specification of Single-shaft Type Combined Cycle

■■■■Start-up Characteristics (hot start)

In a single-shaft type combined-cycle unit, eachretaining the unit's superior start-up characteristenhances power plant operability, and is also efficient flexibility also facilitates automatization

■■■■Partial Load Efficiency (1 unit/4 shafts)

shaft can be stopped independently while still ics and high partial-load efficiency. This feature suitable for intermediate load operation. Suchof the plant's start-and-stop system.

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Major combined-cycle component having high output and high efficiency 1300°C Class Gas Turbine The gas turbine is a major component in a combined cycle power plant. Toshiba adopted its1300°C class, high-output and high-efficiency advanced gas turbine. Toshiba's time-tested gas turbines assure that our combined cycle plants are reliable, require minimum maintenance,and achieve low NOx-emission levels.

Type M59001 FA M57001 FAGas Turbine Output* (KW) 226500 159000 Gas Turbine Thermal Efficiency* (%) 35.7 35.9 Exhaust Gas Flow (kg/s) 613 427 Exhaust Gas Temperature (°C) 589 589 Rotation Speed (rpm) 3000 3600

Ambient Conditions: 15°C, 1 atm 'LHV Base, at Generator Terminal Rated Load Fuel: Liquefied Natural Gas

■■■■Main Components

■■■■Gas Turbine Performance

■First Stage Turbine Nozzle ■First Stage Turbine Blade ■Transition Piece

Hot Parts Cooled by Latest Technologies

Type MS7001FA Gas Turbine

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Stable Combustion lowers NOx emissions Dry Low-NOx Combustor Although liquefied natural gas (LNG) is considered a clean-burning fuel, Toshiba has further decreased NOx emissions in high-temperature gas turbine combustion exhaust by developing a dry low-NOx combustor to restrict NOx generation at its source. Use of a method to pre-mix combustion air and fuel evenly stabilizes combustion. As a result, NOx generation is reduced to one-tenth of that generated using conventional combustion methods.

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■Two-stage Pre-mix Combustion This combustion method minimizes NOx emissions by improved flame stability, which in turn reduces the occurrence of local "hot spots" during the combustion process.

■■■■Pilot Fuel-only Combustions (at low load)

in Fuel e-mixed)

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■Dry Low-NOx Combustor Fuel is impinged from pre-mix ducts installed on the outside surface of the combustor, which stabilizes the flame and reduces NOx emission. This combustor uses simplified, proven structure and fuel control process to assure high operation reliability.

■NOx Emission Characteristics Significantly lower NOx emission levels are realized used in a wide operation zone.

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Quality assurance for system reliability Test/Predictive diagnostics

Of course, the elimination of forced power-plant outages is the minimum goal of anymanufacturer of power-generation systems. Toward this end, Toshiba conductsthorough f full-speed/no-load (FSNL) testing of each gas turbine to ascertain itsreliability. Computer simulation models are applied using predictive-diagnostic andcombustion-analysis technologies to pinpoint any potential flaws in gas-turbine units.

FSNL Test Facility

ter assembly completion, thorough free-speed/no-load (FSNL)ting is conducted using LNG fuel to ascertain turbine reliability.

Suction Nozzle

Fuel Gas Skid

Control Oil Unit L.O. Unit Inlet Duct Test Compartment

Crane

Starting Gear

Shutter

Inlet Plenum

Gas Turbine Gas Turbine Install/Transport Skid

Exhaust Diffuser

Exhaust Duct

Stack

De-NOx Equipment

Measuring Room, Meeting Room (3F)

Operating Control Room (3F)

Electric Room (3F)

■Viscous Fluid Analysis inside Combustor By simulating temperature and flame distributioninside the turbine's combustor, optimal fuelschedules can be prepared for each turbine.

■Combustor Test Rig Toshiba uses an advanced test rig to determine reliable performance data for actual-pressure combustion, flame-transition and reliability testing.

■Life Diagnosis Technologies The test rig's advanced technologies and computer-simulation models allow us to simulate component failures and their effects on the turbine's service life. We focus on the performance reliability of "hot parts" such as turbine blades, nozzles, and the combustor to eliminate failures before they occur.

■Gas Turbine Maintenance TechnologyToshiba's state-of-the-art maintenancefacilities have received full certification fromGeneral Electric Co.

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Recover to utmost gas turbine exhaust heat Large Scale Reheat Multi-Pressure Heat Recovery Steam Generator Toshiba's combined cycle power plant uses a large-scale heat-recovery steam generator (HRSG) thatcaptures heat from a gas turbine's exhaust to create steam. A multi-pressure steam cycle process hasbeen adopted to enable the HRSGs to recover heat efficiently from today's gas turbines with theirever-higher operating temperatures. The result: 47% of fuel energy can be recovered as steamenergy.

Gas Turbine Type MS9001FA MS7001FA Steam Cycle Reheated 3 Pressure Cycle

HP 106 atg, 542°C, 261t/h 100 atg, 542°C, 176t/hIP 27 atg, 360°C, 48t/h 25 atg, 314°C, 35t/h LP 4 atg, 262°C, 32t/h 4 atg, 234°C, 25t/h

Steam Condition

Reheat 24 atg, 542°C, 298t/h 22 atg, 540°C, 204t/h

■Heat Recovery Steam Generator

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■Steam Drum

■Serrated Fin Tube ■Solid Fin Tube

Toshiba's HRSG tube-array design incorporates features to counter fluid-elastic and air-column vibration. The under-support structure of the heat-transmissiontubes makes them light-weighted and therefore can resist larger thermal stressand expansion.

Toshiba's HRSG units use high-,intermediate-, and low-pressure turbinesplus a reheat cycle to recover gas-turbineexhaust heat with maximum efficiency.Another efficiency boost results from use ofheat-transfer tubes of high-fin configurationwhose compactness reduces unit size andfacilitates start and stop times.

Toshiba has decades of experiencemanufacturing HRSG systems that,owing to their module design, can beeasily transported and installed.

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■De-NOx Reactor Ammonia (NH 3) is added to the gas turbine's exhaust to "crack" the NOx molecules into harmless nitrogen and water molecules. Because the ammonia-injection control process is fully automated, no harmful by-products are generated and there is no contaminated drainage water that must be treated.

Cracks and Decrease NOx Dry De-NOx Equipment In addition to reduced NOx emissions that result from use of Toshiba's dry low-NOx combustor (DLNC), additional dry de-NOx equipment is installed with the combined-cycle plant's HRSG. This "cracking" equipment reduces NOx by separating its molecules intoharmless nitrogen and water molecules.

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NOx-Cracking Reaction Process

The de-NOx eqmodules whoscontrol.

■Catalyst Module

4NO+O2+4NH3=>4N2+6H2O

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O+NO2+2NH3=>2N2+3H2O

ipment's catalyst layer is comprised of compact, block-shape ease of installation and replace ability assure stable quality

ront View A-A Section

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With improved efficiency and superior intermediate-load operability Steam Turbine The heat recovery steam generator transfers the gas turbine exhaust heat to its feed water andchanges it into steam. The steam's energy is converted efficiently into rotating energy byToshiba's steam turbine with enhanced efficiency and compact design. Numerous designfeatures to reduce thermal stress enable a high tolerance of frequent quick starts/stops.Superior shaft design based on Toshiba's accumulated decades of experience reduces shaftvibration to a minimum. The unit's high thermal efficiency is achieved across a wide range ofloads, and all steam supplies are fed from beneath the turbine to enhance maintenance access.

To Reheater

HP Steam Reheat Steam

LP Steam

■Double-Flow Exhaust Steam Turbine

■Single-Flow Exhaust Steam Turbine

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OR Easy Start-up, Stable Operational Output

Generator The generator used with Toshiba's combined-cycle power plant is a water- and hydrogen-cooled(for stator and rotor respectively) unit that efficiently converts rotational energy intoelectricity. Toshiba's long history as an integrated manufacturer of electronic devices andsemiconductors enables it to apply leading-edge digital electronic techniques to the generator'scontrol devices. Reliability of the AVR (Automatic-Voltage-Regulator) and the Thyristorstarting system is improved significantly as production and maintenance costs are lowered byreplacing customized printed circuit boards with standard memory circuits.

■Thyristor Starting Method ■Digital ABR

Hydrogen-cooled GeneratorCut-away View

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Digital Control System The increased use of Toshiba's microprocessor-based digital control technologies enablescentralized control over plant systems as diverse as the gas turbine, HRSG, steam turbine andthe generator. The system uses high-resolution color display terminals and a user-friendly manmachine interface that maximizes control while minimizing the number of operators required.Parallel sets of gas and steam turbines can be controlled as if they were a single set.

■CRT Graphic Display (Trend graph being displayed)

■CRT Graphic Display (System flow schematic being displayed)

The plant's superior graphics- and text-based, high-resolution terminals assure real-time control over all plant operations for all loads.

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Combined-Cycle Power Plant Overall Digital-Control System Configuration

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TOSHIBATOSHIBATOSHIBATOSHIBA TOSHIBA CORPORATIONTOSHIBA CORPORATIONTOSHIBA CORPORATIONTOSHIBA CORPORATION

Overseas Office:Rio de Janeiro, Buenos Aires London, Moscow, Vienna, Beijing, Shanghai, Guangzhou,Hong Kong, New Delhi, Bangkok, Taipei, Manila, Jakarta, Colombia,

1-6, UCHISAIWAICHO 1-CHOME, CHIYODA-KU, TOKYO, 100-8510, JAPAN

PHONE: +81-3-3597-2345 FACSIMILE: +B1-3-5512-B115 TELEX: J22587 TOSHIBA

●For further information, please contact your nearest Toshiba Liaison Representative or International Operatio●The data given in this catalog are subject to change without notice.

Toshiba International Corporation:San Francisco, Houston, Vancouver, Toshiba International CorporationPty. Ltd.: Sydney, Melbourne Toshiba International Company Limited: London

ns-Producer Goods.

3038-4 98-8 R1